1. Create your model in MAX.

Remember : to use all my tools, the Back side is equal to the Front ingame!

2. Export you models as dff. In my case, I call it 'dragonst.dff'.

3. Time to create the collision file. I am going to use a simple box for the base. And simple mesh(124 faces) for the dragon.

Collision Mesh must be editable-mesh! (No point to be a primitive,right!?) So be sure to convert it to editable-mesh.

Hint: I can't see why people need more than 1000 face to create collision mesh, It just slow down the game! In my case 124 is enough even too many! I just no time to optimize it! Study the original collision file and you will learn it!

4. Hide or delete the original models(the dff export one), so you won't mess up with collision objects!

5. Now lanuch my 'COL_IO_1b.ms' script. Go to 'Surface Parameters' rollout. You have to set Surface for all your collision meshes(box,sphere).

6. In my case, the base box will be Rock and the dragon will be Steel!

Select the box, and select Rock in the 1st listbox. Press the 'Set Surface' button.

Hint: You can use the 'Get Info.' button to see what's properities there!

7. Select the dragon mesh, and Steel in 1st listbox. Press 'Set Surface' again.

Step 8 is now optional!
8. Your Collision file is almost done. GTA Engine need bounding box and sphere for every collision file! So select ALL the collision objects (dragon and box in my case) Press 'Create Boundings', You will see a box and sphere are create for you.

9. Now is time for export your collision file! Open the 'IO Parameters' rollout, type the name of the collision file in the bottom box.

Remember GTA Engine need it to be the same as your dff file. So in my case, it is call 'dragonst'. Select ALL collision objects (optional)include bounding box and sphere.
Since I am going to create a new file, so press 'Save as'. Give it the name and it is done!

If you want to edit a ready made collision file. Use the 'Open Collision File' and 'Load' button to import the collision objects into max. Edit whatever you want and then re-export again!